Cal. Government Code § 50022.1

(a) “Code,” as used in this article, means any statute, or any published compilation of rules, regulations or standards adopted by the federal government or the State of California, or by any agency of either of them. It shall include any codification or compilation of existing ordinances of the adopting local agency. It shall include any nationally recognized or approved published compilations of proposed rules, regulations or standards of any private organization or institution which has been in existence for a period of at least three years. (b) “Primary code,” as used in this article, means any code which is directly adopted by reference, in whole or in part, by any ordinance passed pursuant to this article. (c) “Secondary code,” as used in this article, means any code which is incorporated by reference, directly or indirectly, in whole or in part, in any primary code or in any secondary code. (d) “Published,” as used in this article, means issued in printed, lithographed, multigraphed, mimeographed or similar form. (e) “Approved,” as used in this article, means the approval of the legislative body of the local agency, as the result of investigation and tests conducted by such agency or by reason of the accepted principles or tests by recognized national or state authorities, technical, or scientific organizations.